How to identify Green Amethyst
Prasiolite (Quartz variety)
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Open the appTo correctly identify Green Amethyst (Prasiolite (Quartz variety)), check each of these features in order. Many rocks and minerals look alike, so cross-reference multiple properties before deciding.
Step-by-step identification
- 1
Color
Overall color and any zoning or banding
Pale green to yellowish-green. The color is generally uniform but can show slight variations.
- 2
Luster
How the surface reflects light: metallic, vitreous, dull
Vitreous (glassy).
- 3
Texture
Grain size and surface feel: coarse, fine, glassy
Smooth to the touch when polished; rougher in its natural crystal form.
- 4
Crystal Form
Shape of visible crystals or crystal faces
Typically forms in hexagonal prisms terminating with rhombohedral faces. Can also be found in massive or granular habits.
- 5
Cleavage
How it breaks: flat cleavage planes vs irregular fracture
None. Quartz lacks cleavage.
- 6
Geological Environment
The rock formation and setting where it occurs
Found in igneous and metamorphic rocks, particularly in pegmatites, hydrothermal veins, and volcanic rocks where amethyst or yellowish quartz has been subjected to natural heat. Also found in alluvial deposits.
Key Facts
- Hardness
- 7 on the Mohs scale
- Specific Gravity
- 2.65 g/cm³
- Crystal System
- Trigonal
- Color
- Pale green to yellowish-green
- Luster
- Vitreous
- Transparency
- Transparent to translucent
- Fracture
- Conchoidal
- Cleavage
- None
- Composition
- Silicon dioxide (SiO2)
Physical characteristics
- Crystal Habit: Prismatic, often forming hexagonal prisms with rhombohedral terminations; also massive, granular.
- Cleavage Type: Absent (no cleavage)
- Fracture Type: Conchoidal (shell-like, curved fractures)
- Tenacity: Brittle
- Luster Type: Vitreous (glassy)
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